The incident happened at approximately 12:30 a.m. in the 17500 block of Imperial Valley Drive near Greens Road.
A man was collecting money while hosting a concert inside a barbershop. He was approached by a male who disarmed him and shot him in the head, police say.
The suspect, described as a black male standing about 6-feet tall and possibly wearing a black sweatshirt or hoodie, also ran off with the money.